液滴撞击圆柱壁面后液膜最大扩展长度的理论分析  

Theoretical Analysis for the Maximum Spreading Lengths of Liquid Film After the Droplet Impacting on Cylindrical Surface

作　　者：罗佳[1,2] 吴双应[1,2] 肖兰[1,2] 陈志莉 LUO Jia;WU Shuang-Ying;XIAO Lan;CHEN Zhi-Li(School of Energy and Power Engineering,Chongqing University,Chongqing 400044,China;Key Laboratory of Low-grade Energy Utilization Technologies and Systems(Chongqing University),Ministry of Education of China,Chongqing 400044,China;College of Environmental Science and Engineering,Guilin University of Technology,Guilin 541006,China)

机构地区：[1]重庆大学能源与动力工程学院,重庆400044 [2]重庆大学低品位能源利用技术及系统教育部重点实验室,重庆400044 [3]桂林理工大学环境科学与工程学院,桂林541006

出　　处：《工程热物理学报》2021年第12期3254-3259,共6页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.51966003);广西自然科学基金资助项目(No.2018GXNSFDA050004);中央高校基本科研业务经费项目(No.2018CDXYDL0001)。

摘　　要：液滴撞击圆柱壁面后,液膜的最大扩展长度是液滴动力学行为的重要方面之一。本文基于能量守恒原理,考虑液滴撞击圆柱壁面前后的动能、重力势能和表面自由能的变化以及液膜扩展过程中的黏性耗散能,建立理论分析模型,获得液膜在圆周方向和轴向上最大扩展长度之间的关系;结合相关文献由实验获得的液膜在轴向上最大扩展长度的经验关联式,进一步求解得出液膜在圆周方向上的最大扩展长度,最后将其计算值与实验测量值进行对比,发现其偏差在7%内,从而验证了模型的可靠性。The maximum spreading length of liquid film is one of the important aspects in dynamic behaviors of droplets after impacting on cylindrical surfaces.In this paper,based on the energy conversation principle,the change of kinetic energy,gravitational potential energy and surface energy before and after the droplet impacting on cylindrical surface,and the viscous dissipation during the droplet spreading process,are considered to build the theoretical analysis model to find the relationship of maximum spreading lengths in circumferential and axial directions.Combined with an empirical formula of the maximum axial length of liquid film obtained from experimental data in related reference,the maximum circumferential length is acquired.At last,the solved maximum circumferential length is compared with that from the experimental measurement,finding that the deviation is within the range of 7%and the reliability of the theoretical analysis model is verified.

关 键 词：液滴撞击 圆柱壁面 液膜扩展 最大长度 理论分析 

分 类 号：TK121[动力工程及工程热物理—工程热物理]